1 /*
2 * linux/arch/unicore32/kernel/module.c
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #include <linux/module.h>
13 #include <linux/moduleloader.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/elf.h>
17 #include <linux/vmalloc.h>
18 #include <linux/fs.h>
19 #include <linux/string.h>
20 #include <linux/gfp.h>
21
22 #include <asm/pgtable.h>
23 #include <asm/sections.h>
24
module_alloc(unsigned long size)25 void *module_alloc(unsigned long size)
26 {
27 struct vm_struct *area;
28
29 size = PAGE_ALIGN(size);
30 if (!size)
31 return NULL;
32
33 area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
34 if (!area)
35 return NULL;
36
37 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
38 }
39
40 int
apply_relocate(Elf32_Shdr * sechdrs,const char * strtab,unsigned int symindex,unsigned int relindex,struct module * module)41 apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
42 unsigned int relindex, struct module *module)
43 {
44 Elf32_Shdr *symsec = sechdrs + symindex;
45 Elf32_Shdr *relsec = sechdrs + relindex;
46 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
47 Elf32_Rel *rel = (void *)relsec->sh_addr;
48 unsigned int i;
49
50 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
51 unsigned long loc;
52 Elf32_Sym *sym;
53 s32 offset;
54
55 offset = ELF32_R_SYM(rel->r_info);
56 if (offset < 0 || offset >
57 (symsec->sh_size / sizeof(Elf32_Sym))) {
58 printk(KERN_ERR "%s: bad relocation, "
59 "section %d reloc %d\n",
60 module->name, relindex, i);
61 return -ENOEXEC;
62 }
63
64 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
65
66 if (rel->r_offset < 0 || rel->r_offset >
67 dstsec->sh_size - sizeof(u32)) {
68 printk(KERN_ERR "%s: out of bounds relocation, "
69 "section %d reloc %d offset %d size %d\n",
70 module->name, relindex, i, rel->r_offset,
71 dstsec->sh_size);
72 return -ENOEXEC;
73 }
74
75 loc = dstsec->sh_addr + rel->r_offset;
76
77 switch (ELF32_R_TYPE(rel->r_info)) {
78 case R_UNICORE_NONE:
79 /* ignore */
80 break;
81
82 case R_UNICORE_ABS32:
83 *(u32 *)loc += sym->st_value;
84 break;
85
86 case R_UNICORE_PC24:
87 case R_UNICORE_CALL:
88 case R_UNICORE_JUMP24:
89 offset = (*(u32 *)loc & 0x00ffffff) << 2;
90 if (offset & 0x02000000)
91 offset -= 0x04000000;
92
93 offset += sym->st_value - loc;
94 if (offset & 3 ||
95 offset <= (s32)0xfe000000 ||
96 offset >= (s32)0x02000000) {
97 printk(KERN_ERR
98 "%s: relocation out of range, section "
99 "%d reloc %d sym '%s'\n", module->name,
100 relindex, i, strtab + sym->st_name);
101 return -ENOEXEC;
102 }
103
104 offset >>= 2;
105
106 *(u32 *)loc &= 0xff000000;
107 *(u32 *)loc |= offset & 0x00ffffff;
108 break;
109
110 default:
111 printk(KERN_ERR "%s: unknown relocation: %u\n",
112 module->name, ELF32_R_TYPE(rel->r_info));
113 return -ENOEXEC;
114 }
115 }
116 return 0;
117 }
118